I've volunteered to create an invert calender for a non-profit research group. they already sell t-shirts, cups, etc through Cafe Press http://www.cafepress.com/scamit and want the calender to go through them too. Has anyone had experience with Cafe Press or other do-it-yourself calender printers? Any advice you can give me on producing a high quality item? I'm guessing it will be a hot item for invert researchers and I want it to be good. All profits will go into our publication grant & student support funds.